An archaic form of 'says,' used in older English texts and the King James Bible to mean 'he or she says or said.'
From Old English 'secgth,' the third-person singular of 'say.' The '-eth' ending was standard in Early Modern English before disappearing around 1700.
The King James Bible's 'saith' is why many people sound British when quoting scripture—that language was already old-fashioned even in 1611, chosen deliberately to make the text feel timeless and sacred.
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